All objects which spawn new particles now have a 'spawn once only' switch to prevent multiple spawning

Disabling a System object in the Object Manager will now disable all X-Particles objects in the object hierarchy under that System object

Emitters can now be set to be influenced only by modifiers in the same System object hierarchy as the emitter

New birthrate spline GUI added to the Emitter's particle emissions tab, allowing you to vary the emission rate over time

The Freeze modifier and corresponding Action now have the freeze movement, spin, and scale switches on by default (before, a Freeze modifier could be added but then had no effect until those switches were turned on manually)

New Question type - test for frozen particle - added

New Question type - test for recent collision - added

The Change Geometry Action now has several additional options to change the objects produced by a Generator or Sprite object

The Deflector modifier can now trigger Actions on collision

A spline interface to control scale has been added to the Scale modifier

The Cover/Fill modifier can now accept vertex maps as well as selection tags

Several new options added to the Cover/Fill modifier

The Control Trail Action has been recoded and its interface altered slightly to make it more logical and easier to work with